The fearless pirates kept _______ on the waters off the coat of Somalia, from the Gulf of Aden to the Kenya border along the Indian Ocean.
| A．knocking on | B．knocking down |
| C．knocking about | D．knocking at |
________ by the advances in technology, many farmers have set up wind farms on their land.
| A．Being encouraged | B．Encouraging |
| C．Encouraged | D．Having encouraged |
________ twice, the postman refused to deliver our letters unless we chained our dog.
| A．Being bitten | B．Bitten |
| C．Having bitten | D．To be bitten |
________ and short of breath, Andy and Ruby were the first to reach the top of Mount Tai.
| A．To be tried | B．Tired |
| C．Tiring | D．Being tired |
Now that we’ve discussed our problem, are people happy with the decisions ________?
| A．taking | B．take |
| C．taken | D．to take |
. For breakfast he only drinks juice from fresh fruit ________ on his own farm.
| A．grown | B．being grown |
| C．to be grown | D．to grow |